Too much fuel and fouling the plugs, Checked for broken wires and obvious things Options

[9fourteen14]

Check the cylinder head temp sender. If it is open, then the computer thinks it is below -20 degrees F, so it dumps gas into the engine. Usually this results in fouled plugs and gas in the oil.


Most common cause is the connection between the sender and the harness. The plug will look like it is connected, even when it is not.

+1, and this can happen even to a person called "the D-Jet expert", cough, cough. I drove around for about a year bitching about a problem with surging that I swore was a bad TPS, only to find that the CHT sensor female connector wasn't actually pushed on to the male wiring harness connector, but was instead jammed between the plastic and the metal connector. Every time I hit a bump it would open and make the car jerk. I fixed it and my being a jerk was over.

The L-Jet and the D-Jet system use the exact same CHT, and connectors. So it can happen on any 914 with the stock FI. I did it on Betty's car. Chased the poor running and black smoke for 3 days before finding I didn't get that damned spade connector connected solidly. It would open circuit randomly. Drove me batshit crazy looking for the issue.

This is the same sensor for a 911 Carrera 3.2. The resistance values in it are exactly the same as the 914 sensor.

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.autohausaz.com-1143-1476013429.1.jpg)

Note that the connector on it is the same as an L-Jet fuel injector. Replace the stock sensor with this, and put an L-Jet fuel injector connector on the CHT wire

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.autohausaz.com-1143-1476013431.2.jpg)

Then hook the other one to a solid ground.

You will never have that spade connector issue again.

thanx guys.. I will work on this for the rest of the day and monday 10/10/16.
will get back to you with the outcome. i really appreciate it.

[9fourteen14]

Check the cylinder head temp sender. If it is open, then the computer thinks it is below -20 degrees F, so it dumps gas into the engine. Usually this results in fouled plugs and gas in the oil.


Most common cause is the connection between the sender and the harness. The plug will look like it is connected, even when it is not.

+1, and this can happen even to a person called "the D-Jet expert", cough, cough. I drove around for about a year bitching about a problem with surging that I swore was a bad TPS, only to find that the CHT sensor female connector wasn't actually pushed on to the male wiring harness connector, but was instead jammed between the plastic and the metal connector. Every time I hit a bump it would open and make the car jerk. I fixed it and my being a jerk was over.

The L-Jet and the D-Jet system use the exact same CHT, and connectors. So it can happen on any 914 with the stock FI. I did it on Betty's car. Chased the poor running and black smoke for 3 days before finding I didn't get that damned spade connector connected solidly. It would open circuit randomly. Drove me batshit crazy looking for the issue.

This is the same sensor for a 911 Carrera 3.2. The resistance values in it are exactly the same as the 914 sensor.

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.autohausaz.com-1143-1476013429.1.jpg)

Note that the connector on it is the same as an L-Jet fuel injector. Replace the stock sensor with this, and put an L-Jet fuel injector connector on the CHT wire

(IMG:http://www.914world.com/bbs2/uploads_offsite/www.autohausaz.com-1143-1476013431.2.jpg)

Then hook the other one to a solid ground.

You will never have that spade connector issue again.

thanx guys.. I will work on this for the rest of the day and monday 10/10/16.
will get back to you with the outcome. i really appreciate it.

see new post on CHT